Remove unused thread pool from standalone VM binary.

runtime/bin/eventhandler.cc

Index: runtime/bin/eventhandler.cc
diff --git a/runtime/bin/eventhandler.cc b/runtime/bin/eventhandler.cc
index 6455d9ecdd26c47caa5e8a4d429ca7f973d0f073..169f349702ff6f932eed1e4622aada85500ad273 100644
--- a/runtime/bin/eventhandler.cc
+++ b/runtime/bin/eventhandler.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
@@ -10,8 +10,6 @@
 
 static const intptr_t kNativeEventHandlerFieldIndex = 0;
 
-ThreadPool* EventHandler::thread_pool_ = NULL;
-
 /*
  * Returns the reference of the EventHandler stored in the native field.
  */